[Bug rtl-optimization/31703] New: [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[Bug rtl-optimization/31703] New: [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[hjl at lucon dot org]

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bash-3.1$ ./xgcc -m32 -B./ -O2 -S /tmp/reload1.i 
reload1.c: In function ‘reload_reg_free_p’:
reload1.c:4420: internal compiler error: in simplify_subreg, at
simplify-rtx.c:4677
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

Revision 123850 is OK.


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           Summary: [4.3 regression]: Gcc 4.3 revision 124101 failed to
                    compile gcc 3.2
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug rtl-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[hjl at lucon dot org]

------- Comment #1 from hjl at lucon dot org  2007-04-25 15:25 -------
Created an attachment (id=13440)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13440&action=view)
A testcase


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug rtl-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[hjl at lucon dot org]

------- Comment #2 from hjl at lucon dot org  2007-04-25 17:24 -------
I have verified that this patch

http://gcc.gnu.org/ml/gcc-patches/2007-04/msg01399.html

causes this regression. On Linux/i686, it fails to compile gcc 3.2. On
Linux/x86-64, it miscompiles gcc 3.2.


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hjl at lucon dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
           Severity|normal                      |critical


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug rtl-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[hjl at lucon dot org]

------- Comment #3 from hjl at lucon dot org  2007-04-25 18:15 -------
rewrite_bittest has

  lhs = GENERIC_TREE_OPERAND (stmt, 0);
  ...

      /* A & (1 << B) */
      t = fold_build2 (BIT_AND_EXPR, TREE_TYPE (a), a, name);
      stmt2 = build_gimple_modify_stmt (lhs, t);

When A & (1 << B) is long long and lhs is int, we may get a problem.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[pinskia at gcc dot gnu dot org]

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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|rtl-optimization            |tree-optimization
           Keywords|                            |ice-on-valid-code
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[sje at cup dot hp dot com]

------- Comment #4 from sje at cup dot hp dot com  2007-04-26 00:58 -------
The patch mentioned in Comment #2 is also causing problems on IA64 Linux and
HP-UX.  If I build a bootstrap compiler and then use the resulting fortran
compiler to compile the SPEC 2006 benchmark 173.applu the resulting executable
will abort.  After reading comment #3 I put a 'return stmt' in rewrite_bittest
to make the function a no-op and that allowed me to do a bootstrap build and
compile 173.applu correctly.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-04-26 09:53:22
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-04-26 10:35 -------
Re comment #3: doh, you are right.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-04-26 16:28 -------
Subject: Bug 31703

Author: rguenth
Date: Thu Apr 26 16:28:14 2007
New Revision: 124190

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=124190
Log:
2007-04-26  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/31703
        * tree-ssa-loop-im.c (rewrite_bittest): Make sure to use
        the right type for the target of the bittest.

        * gcc.c-torture/compile/pr31703.c: New testcase.
        * gcc.dg/tree-ssa/ssa-lim-1.c: Adjust pattern.
        * gcc.dg/tree-ssa/ssa-lim-2.c: Likewise.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr31703.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-1.c
    trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-lim-2.c
    trunk/gcc/tree-ssa-loop-im.c


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703

[Bug tree-optimization/31703] [4.3 regression]: Gcc 4.3 revision 124101 failed to compile gcc 3.2

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2007-04-26 16:32 -------
Fixed.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
           Keywords|                            |wrong-code
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31703